Tire with double half-carcasses and adapted crown zone

Abstract

A tire comprising at least one reinforcement structure of carcass type anchored on each side of the tire in a bead, a crown reinforcement, sidewalls meeting up radially towards the outside with a tread, the carcass-type reinforcement structure extending circumferentially from the bead towards said sidewall and being discontinuous over at least a portion of the crown of the tire, said crown reinforcement comprising on the one hand at least one primary reinforcement structure covering substantially the entire width of the crown and on the other hand at least one series of circumferential reinforcements also covering substantially the entire width of the crown, said series of circumferential reinforcements comprising a portion of lateral circumferential reinforcements disposed radially to the outside relative to said primary reinforcement structures and a portion of median circumferential reinforcements disposed radially to the inside relative to said primary reinforcement structures.

1. A tire comprising at least one reinforcement structure of carcass type anchored on each side of the tire in a bead whose base is designed to be mounted on a rim seat, a crown reinforcement, each bead being extended radially towards the outside by a sidewall, the sidewalls meeting up radially towards the outside with a tread, the carcass-type reinforcement structure extending circumferentially from the bead towards said sidewall and being discontinuous over at least a portion of the crown of the tire, said crown reinforcement comprising on the one hand at least one primary reinforcement structure covering substantially the entire width of the crown and on the other hand at least one series of circumferential reinforcements also covering substantially the entire width of the crown, said series of circumferential reinforcements comprising a portion of lateral circumferential reinforcements disposed radially to the outside relative to said primary reinforcement structures and a portion of median circumferential reinforcements disposed radially to the inside relative to said primary reinforcement structures. 
   
   
     2. The tire of  claim 1 , in which said median circumferential reinforcement portion is disposed substantially between the end portions of the carcass-type reinforcement structures. 
   
   
     3. The tire of  claim 1 , also comprising a secondary reinforcement structure disposed radially towards the outside relative to the primary reinforcement structure, substantially between the lateral reinforcement portions. 
   
   
     4. The tire of  claim 1 , in which the primary and/or secondary reinforcement structure comprises cord elements generally arranged at an angle other than zero degrees relative to the circumferential direction. 
   
   
     5. The tire of  claim 1 , also comprising a peripheral rubber mix zone disposed radially towards the outside relative to the primary reinforcement structure, substantially between the lateral reinforcement portions. 
   
   
     6. The tire of  claim 1 , also comprising at least one substantially median extra-deep hollow. 
   
   
     7. The tire of  claim 1 , in which the reinforcement structure of carcass type is double over at least one of the two sides of said tire.